物探与化探2017，Vol.41Issue(1)：158-164,7.DOI:10.11720/wtyht.2017.1.25
考虑毛细管压力的纵波速度衰减特征分析——以球状斑块饱和模型为例
An analysis of P wave attenuation in consideration of capillary forces:Exemplified by spherical patchy saturation model
摘要
Abstract
The attenuation and dispersion of seismic wave will occur when seismic wave propagates in patchy-saturated media and is influenced by fluid patch distribution and size.The patch characteristics in turn can be influenced by capillary forces mainly.The effect of capillarity on wave attenuation in patchy-saturated rocks is not fully understood.In view of such a situation,the authors make use of the concept of patch membrane stiffness as a macroscopic expression of capillarity,incorporate the capillary forces into spherical patchy saturation model by changing a pressure discontinuity at patch interfaces,get a new model and compare the variation of wave attenuation and dispersion before and after the consideration of the capillarity based on the new model.It is suggested that considering capillarity will increase seismic velocity and decrease the dispersion and attenuation coefficient.The authors applied this capillary-extended spherical patchy saturation model to interpret velocity-saturation and attenuation-saturation relations.A comparison with the original model shows that the new model can fit the velocity-saturation and attenuation-saturation experimental relation trend well,which suggests that capillary-extended spherical patchy saturation model can have important implications for interpreting velocity-saturation and attenuation-saturation relations in patchy-saturated rocks.关键词
速度频散/衰减/球状斑块饱和模型/毛细管压力/膜刚度Key words
seismic dispersion/attenuation/spherical patchy saturation model/capillary forces/membrane stiffness分类
天文与地球科学引用本文复制引用
何锋,张广智,张佳佳,裴忠林,印兴耀..考虑毛细管压力的纵波速度衰减特征分析——以球状斑块饱和模型为例[J].物探与化探,2017,41(1):158-164,7.基金项目
国家重点基础研究发展计划(“973”计划)项目(2014CB239201-7Hz、2013CB228604) （“973”计划）
国家科技重大专项(2016ZX05027004-001、2016ZX05002006-004) （2016ZX05027004-001、2016ZX05002006-004）
国家自然科学基金项目(41404088) （41404088）
中央高校基本科研业务费专项资金项目(14CX02113A) （14CX02113A）
